[rbg81]

In the scene where Decker looks in the mirror there is an electric glow which flashes in his eyes....

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Okay, I’ll bite. If the replicants have an electric glow in their eye, then why is it so hard to detect them? Why the elaborate word test?

I don’t doubt they put that scene in there. But, IMHO, was a dumb move because it does not track with the rest of the story.

[circlecity]

"I don’t doubt they put that scene in there. But, IMHO, was a dumb move because it does not track with the rest of the story."

The movie pointed out several times that the Batty crew were the most advanced line of replicants the Tyrell corporation had ever produced. If Deckard was a replicant maybe he was an earlier model. That would also explain why he wasn't as strong as the Batty crew. I have absolutely nothing to base this on but it would fill the plot hole.